Locking mechanism for stop-cock boxes.



J. J. CUNNINGHAM.

LOCKING MECHANISM FOR STOP COCK BOXES.

APPLICATION FILED SEPT. 20, 1912.

' 1 209,562. Patented Dec. 19, 1916.

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JOHN J. CUNNINGHAM, 0F GADSDEN, ALABAMA.

LOCKING MECHANISM FOR' STOP-COCK BOXES.

Specification of Letters Patent.

Patented Dec. 19, 1916.

Application filed. September 20, 1912. Serial No. 721,447.

when seated in the bell end of the pipe, will be locked therein so thatit cannot be removed without the insertion of a key for re leasing thefastening means.

This invention consists of certain novel features of construction andcombinations of parts which will be hereinafter described and pointedout in the claim.

In the accompanying drawings Figure 1 is a plan view of the cover open,showing the locking means applied thereto; Fig. 2 is a verticalsectional view showing the cover in locked position; Fig. 3 is a detailview of the key.

A represents the pipe, and B is the bell which is provided with anannular recess 1 in the top thereof in which recess the cover 2 ismounted, the cover being hinged to the bell by a strap 4: which isconnected to the cover. Trunnions 5 on the strap are received in sockets6 connected to the bell B.

Mounted upon the inner surface of the cover is a bolt 7 which isprovided with an elongated slot 8 through which a pin 9 projects fromthe cover and which is provided with lugs 10 which engage the sides ofthe bolt for holding them upon the cover.

A bracket 11 is mounted upon the cover through which a stem 12 formed onthe bolt protrudes anda nut 13 is screwed upon the stem for fasteningthe stem and bolt to the bracket. A coil spring 14; surrounds the stemand is located between the bracket and Copies of this patent may beobtained for five cents each, by addressing the the shoulder 15 formedon the bolt for normally holding the bolt at its outermost position.

An opening or keeper 16 is formed in the wall of the pipe beneath therecess 1 in which the bolt is adapted to be sprung when the cover isdrawn to its closed position so that the cover is automatically lockedin position and forced into the recess. The key 17 shown in Fig. 2 isadapted to be inserted in a key hole slot 18 in the cover and engagesthe shoulder 15 for withdrawing the bolt 1 from engagement with thekeeper when it is desired to raise the cover, for the purpose ofinserting a tool into the pipe when it is desired to turn on or cut offthe supply passing through the main.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is- A locking mechanism for stopcock boxescomprising a cover, a bolt mounted upon the inner surface of the cover,said bolt provided with an elongated slot, a pin projecting from thecover through said slot, said pin provided with a central portionsubstantially coinciding with said slot in thickness and with laterallyextending lugs of less diameter which support the sides of the bolt, abracket secured to the cover through which the stem of the bolt slides,a shoulder secured on the bolt, a spring mounted on the stem of the boltbetween the shoulder and bracket, said shoulder resting against the pinas a stop in its normal position and a key adapted to turn in the coverin contact with the shoulder whereby to withdraw the bolt and unlock thecover.

In testimony whereof I affix my signature in the presence of twowitnesses.

JOHN J. CUNNINGHAM.

Witnesses:

F. G. MCBROOM, J AS. D. GILES.

Commissioner of Patents,

Washington, D. G.

